@article{article5a0d5e74,
title   = {Energy transfer and the 2.8-'MÜ'm emission of 'Er POT.3+'- and 'Yb POT.3+'- doped low silica content calcium aluminate glasses},
author = {Sousa, D. F. and Sampaio, J. A. and Nunes, Luiz Antônio de Oliveira and Baesso, Mauro Luciano and Bento, A. C. and Miranda, L. C. M.},
year = {2000},
journal   = {Physical Review B}
}